keyDown 没有被调用 [英] keyDown not being called

问题描述

我有一个名为 SurfaceView 的自定义 NSView.它是 NSWindow 的 contentView，它处理鼠标点击和绘图等基本事件.但不管我做什么，它不处理 keyDown 功能.我已经覆盖了acceptsFirstResponder，但没有任何反应.

I have a custom NSView called SurfaceView. It is the contentView of a NSWindow and it handles basic events like mouse click and drawing. But don't matters what I do, it does not handle the keyDown function. I've already override the acceptsFirstResponder but nothing happens.

如果重要，我会使用自定义 NSEvent 循环运行应用程序，如下所示:

If it matters, I run the application using a custom NSEvent loop, shown below:

NSDictionary* info = [[NSBundle mainBundle] infoDictionary];
NSString* mainNibName = [info objectForKey:@"NSMainNibFile"];

NSApplication* app = [NSApplication sharedApplication];
NSNib* mainNib = [[NSNib alloc] initWithNibNamed:mainNibName bundle:[NSBundle mainBundle]];
[mainNib instantiateNibWithOwner:app topLevelObjects:nil];

[app finishLaunching];

while(true)
{   
    NSEvent* event = [app nextEventMatchingMask:NSAnyEventMask untilDate:[NSDate date] inMode:NSDefaultRunLoopMode dequeue:YES];
    [app sendEvent:event];

    // Some code is execute here every frame to do some tasks...

    usleep(5000);
}

这是 SurfaceView 代码:

Here's the SurfaceView code:

@interface SurfaceView : NSView
{
    Panel* panel;
}

@property (nonatomic) Panel* panel;

- (void)drawRect:(NSRect)dirtyRect;
- (BOOL)isFlipped;
- (void)mouseDown:(NSEvent *)theEvent;
- (void)mouseDragged:(NSEvent *)theEvent;
- (void)mouseUp:(NSEvent *)theEvent;
- (void)keyDown:(NSEvent *)theEvent;
- (BOOL)acceptsFirstResponder;
- (BOOL)becomeFirstResponder;

@end

--

@implementation SurfaceView

@synthesize panel;

- (BOOL)acceptsFirstResponder
{
    return YES;
};

- (void)keyDown:(NSEvent *)theEvent
{
    // this function is never called
};

...

@end

这是我创建视图的方式:

Here's how I create the view:

NSWindow* window = [[NSWindow alloc] initWithContentRect:NSMakeRect(left, top, wide, tall) styleMask:NSBorderlessWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask backing:NSBackingStoreBuffered defer:NO];

...

[window makeKeyAndOrderFront:nil];

SurfaceView* mainView = [SurfaceView alloc];
[mainView initWithFrame:NSMakeRect(0, 0, wide, tall)];
mainView.panel = panel;
[window setContentView:mainView];
[window setInitialFirstResponder:mainView];
[window setNextResponder:mainView];
[window makeFirstResponder:mainView];

推荐答案

我发现是什么阻止了 keyDown 事件被调用.它是 NSBorderlessWindowMask 掩码，它防止窗口成为键和主窗口.所以我创建了一个名为 NSWindow 的子类 BorderlessWindow:

I found out what was preventing the keyDown event from being called. It was the NSBorderlessWindowMask mask, it prevents the window from become the key and main window. So I have created a subclass of NSWindow called BorderlessWindow:

@interface BorderlessWindow : NSWindow
{
}

@end

@implementation BorderlessWindow

- (BOOL)canBecomeKeyWindow
{
    return YES;
}

- (BOOL)canBecomeMainWindow
{
    return YES;
}

@end

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